Method and apparatus for securing superimposed windings of a coil

ABSTRACT

A method and apparatus for adhesively securing two windings at the beginning and end of a wound up band by a tape adhesive on both sides. The tape adheres to a lateral strip portion of a carrier web, which is supplied to the wound up band, and then also adheres to the same. The other lateral strip portion is folded over so that the carrier web becomes stiff. The tape is peeled off the stiff folded carrier web when bent with the wound up band about an edge.

United States Patent Herrmann [4 1 May 16, 1972 [54] METHOD ANDAPPARATUS FOR SECURING SUPERIMPOSED WINDINGS OFACOIL [72] Inventor:Helmut Herrmann, Cologne-Braunsfeld,

Germany [73] Assignee: Metalloxyd GmbH, Cologne-Braunsfeld,

Germany [22] Filed: Apr. 29, 1970 [21] Appl.No.: 33,000

[30] Foreign Application Priority Data July 11, 1969 Germany P 19 35353.8

[52] US. Cl ..l56/540, 156/191, 156/470, 242/561 [51] lnt.Cl. ..B65h39/16, B32b 31/10 [58] Field ofSearch ..156/l9l,446, 470, 471,554,156/540-542; 242/561 [56] References Cited UNITED STATES PATENTS2,547,644 4/1951 Hogue et al ..242/56.1 3,227,388 l/1966 Masini..242/56.1 3,420,429 l/l969 Lewis et a1... ..242/56.l 3,172,612 3/1965Besserdich... 156/446 3,446,690 5/ l 969 Charles 156/446 PrimaryExaminer-Benjamin A. Borchelt Assistant Examiner-James M. HanleyAltorney-Michae1 S. Striker [5 7] ABSTRACT A method and apparatus foradhesively securing two windings at the beginning and end of a wound upband by a tape adhesive on both sides.'The tape adheres to a lateralstrip portion of a carrier web, which is supplied to the wound up band,and then also adheres to the same. The other lateral strip portion isfolded over so that the carrier web becomes stiff. The tape is peeledoff the stiff folded carrier web when bent with the wound up band aboutan edge.

12 Claims, 9 Drawing Figures Patented May 16, 1972 4 mm; NFL W m N Fr, Iwf H HM M.

METHOD AND APPARATUS FOR SECURING SUPERIMPOSED WINDINGS OF A COILBACKGROUND OF THE INVENTION The present invention relates to apparatusfor securing the outermost or innermost windings of a coil wound of aband, particularly metal band, by a tape adhesive on both sides andadhering to two superimposed windings. The invention is also concernedwith an attaching band which is advantageously used in the apparatus ofthe invention, and when carrying out the method of the invention.

The wound up coils may consist of eloxadized aluminum band in which theeloxation layer constitutes an insulator between successive windings.According to the prior art, the innermost and outermost windings aresecured by a piece of tape adhesive on both sides. This means that atthe beginning and end of the winding of each coil, a piece of tape hasto be wound into the coil. The tape is adhesively secured to a carrierweb, and separated from the same by bending the carrier web about anedge an angle of 180, so that the adhesive tape separates from thecarrier web. The peeled off tape is then cut, and a piece of the samedrops onto the band which is being wound, adheres to the same, and iswound into the coil.

The apparatus according to the prior art is not absolutely reliable,since under unfavorable circumstances regarding temperature or qualityof the adhesive material, the adhesive tape may not separate properlyfrom the carrier web.

It is an object of the invention to provide a method and ap paratus foradhesively securing two superimposed windings of a coil which reliablyoperates and permits fully automatic operations without disturbances.

Another object of the invention is to provide an attaching bandcomprising a carrier and an adhesive tape, which can be handled by anautomatic machine without engagement of the adhesive tape.

Another object of the invention is to separate the adhesive tape fromthe carrier tape by folding the latter so that it becomes stiff.

SUMMARY OF THE INVENTION With these objects in view, a method accordingto invention comprises winding up a band to form a coil of superimposedwindings; supplying to the hand during winding of the same an attachingunit including a carrier sheet and a narrow tape adhesive on both sidesand being attached with one adhesive side to one lateral strip portionof the carrier sheet so that the other adhesive side of the tape adheresto a portion of the band whereby the attaching unit is transported bythe band; folding the other lateral strip portion of the carrier sheetout of the plane of the one lateral strip portion and of the adhesivetape about a longitudinal fold line so that the folded carrier sheetbecomes stiff; bending the band away from the stiff folded carrier sheetso that the adhesive tape, unable to bend the same, adheres to the bentportion of the band and is peeled off from the folded carrier sheet;winding up the portion of the band with the adhesive tape to form awinding having the adhesive tape on the outside thereof; and windinganother winding superimposed on said winding and on the one adhesiveside of the tape so that the windings are secured to each other andprevent unwinding ofthe coil.

Preferably, an attaching band composed of integrally connected attachingunits and including a carrier web-and a narrow adhesive tape webadhesively attached to the same, is supplied and is stepwisetransported. The attaching units are cut off the attaching band, andeach attaching unit is placed on a portion of the wound up band.Preferably, pressure is applied to each attaching unit so that theadhesive tape adheres to the wound up band.

An apparatus according to the embodiment of the invention comprisesrotary take-up means for winding up a band; first guide means having aguide channel for guiding a supplied band to the take-up means, andhaving a bending edge at the delivery end of the guide channel aboutwhich the band is bent LII before being wound up; second guide means forguiding an attaching band into the guide channel, said attaching bandincluding a wide carrier web and a narrow tape adhesive on both sidesand being adhesively attached with one adhesive side to one lateralstrip portion of the carrier web, said attaching band being guided in aposition in which the other adhesive side of the tape is placed on aface of the wound up band; presser means engaging the strip portion forpressing the tape against said face of said band so that the otheradhesive side of the tape adheres to the face and the attaching bandmoves with the wound up band; and folding means in the guide channel forfolding the other lateral strip portion of the carrier web out of theplane of the one strip portion and of the adhesive tape so that thefolded carrier web becomes stiff whereby the adhesive tape bending withthe wound up band about the bending edge is peeled off the stiffunbendable carrier web and is placed between two superimposed windingsof the wound up band adhesively connecting the same.

In the preferred embodiment of the invention, the apparatus comprisestransporting means engaging the other strip portion of the carrier webfor stepwise transporting the attaching band along the second guidemeans; and cutting means for cutting the stepwise transported attachingband after each step. In this manner, the attaching band is cut intoattaching units, each having a carrier sheet and a piece of adhesivetape, and each unit is supplied to the wound up band in the guidechannel and being transported by the wound up band due to the adheringof the adhesive tape portion of the respective attaching unit to thewound up band.

An attaching band according to the invention comprises a carrier webhaving a predetermined width; and a tape adhesive on both sides andbeing substantially narrower than the carrier web. The tape isadhesively attached with one adhesive side to one longitudinal lateralstrip portion along one edge of the carrier web, so that the otherlateral longitudinal strip portion of the carrier web can be handled ina machine without touching the exposed other adhesive side of the tape.In the preferred embodiment of the invention, the adhesive tape is abouthalf as wide as the carrier web so that the carrier web can be foldedabout a longitudinal fold line located substantially at the longitudinalcenter line of the carrier web.

The free longitudinal strip portion of the carrier web may be engaged bytransporting means and by folding means which do not get into contactwith the exposed adhesive side of the tape.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and its method ofoperation, together with additional objects and advantages thereof, willbe best understood from the following description of specificembodiments when read in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a fragmentary schematic sideelevation illustrating a winding apparatus provided with the apparatusof the invention;

FIG. 2 is a fragmentary side elevation illustrating a part of thewinding machine shown in FIG. 1 in an other operational position;

FIG. 3 is a fragmentary sectional view taken on line IIIIII in FIG. 1;

FIG. 4 is a fragmentary sectional view taken on line lV-IV in FIG. 1;

FIG. 5 is a fragmentary sectional view taken along a line parallel toline IVIV;

FIG. 6 is a fragmentary plan view illustrating a portion of the wound upband with adhering adhesive tape;

FIG. 7 is a fragmentary perspective bottom view of a portion of theattaching band including a carrier web and an adhesive tape;

FIG. 8 is a fragmentary side elevation illustrating a modification ofthe apparatus of FIG. I; and

'FIG.8.

DESCRIPTION OF THE PREFERRED EMBODIMENTS As best seen in FIG. 7, anattaching band 33 according to the invention includes a carrier web 34to which an adhesive tape 36 is adhesively attached. The adhesive tape36 is adhesive on both sides, and adheres to the wider carrier web 34along one edge 35 of the same. In this manner, the narrow adhesive tape36 covers one longitudinal strip portion of carrier web 34 along theedge 35, and the other longitudinal strip portion 37 of carrier web 34remains free.

As will be described hereinafter, the attaching band 33 is cut intoattaching units, each of which includes a carrier sheet, which is asection of the carrier web 34, and a tape portion which is a section ofthe tape 36.

Referring now to FIGS. 1 and 2, a winding machine includes a turret 10which is turnable about a shaft 12 in the direction of the arrow 11, andcarries three rotary mandrels l5. Turret 10 can be turned steps of 120,so that the three mandrels 15 can be placed in three positions A, B andC. It is possible to wind on each mandrel 15, one or several coils 26 ofa band 20.

Each mandrel 15 has axially extending spreading arms 16 which can beadjusted in radial direction to increase or decrease the diameter of themandrel. In FIG. 1, the spreading arms 16 are shown in the spreadposition, while FIG. 2 shows the mandrel in the position C in acondition in which the spreading arms 16 are retracted, and the diameterof the mandrel is small. When the spreading arms 16 are in the retractedposition, a finished coil can be pulled off the mandrel in axialdirection. During a winding up operation, the spreading arms 16 areoutwardly advanced.

When a mandrel l5, 16 is in the position A, a bent connector piece 17 isinserted with one end into the gap between mandrel l and a spreading arm16. Thereupon, turret is turned 120 so that the respective mandrel isplaced in the position B. The band 20, or several adjacent bands 20, notshown, which are being wound up on mandrel 15, 16 in the position C,contact the adhesive outer surface of the connector piece 17, as shownin FIG. 1, and adhere to the same. A cutting means 19 is now operated tocut off the band so that the finished coil can be removed in axialdirection after the respective spreading arms 16 have been retracted, asshown at C in FIG. 2. The mandrel 15 with expanded spreading arms 16 inthe position B is now coupled by coupling means, not shown, with a drivemotor and rotated in the direction of the arrow 18 to wind up the band26 in as many windings as required for a complete coil 26. When themandrel in the position B carries a completely wound coil 26, as shownin FIG. 2, the drive motor is disengaged from the respective mandrel l5,and turret 10 is turned 120 so that the completed coil 26 is in theposition C. The spreading arms 16 of the respective mandrel 15. are nowretracted, as shown in FIG. 2, and after the cutting means 19 has cutoff the respective band 20, coil 26 can be removed from the respectivemandrel in axial direction.

As shown in FIG. 1, adhesive tape pieces 27, which are adhesive on bothsides, are inserted between the first two windings and the last twowindings of the coil 26 so that undesired uncoiling of a resilient band20 is prevented. The present invention is concerned with the method andapparatus for securing two windings at the beginning and end of a coilby means of tape pieces 27 which are adhesive on both sides and stick tothe respective superimposed windings.

The band 20, which is to be wound up on the take-up means 15, 16, issupplied into a U-shaped guide channel 24 provided in a guide means 23,as best seen in FIG. 4. The surface of guide channel 24, andparticularly of its bottom face, is advantageously covered with a lowfriction coating consisting, for example, of polytetrafluorethylene, andthe lateral walls of the guide channel 24 provide only very littlelateral play for the wound up band 20. If several bands 20 aresimultaneously wound into several coils 26 on the same mandrel, aplurality of adjacent guide channels 24 is provided in guide means 23,and in the following description it will be assumed that only one guidechannel 24 is provided, and only one coil 26 is wound up and secured bytape pieces 27. Turret 10 and take-up means 15, 17 in the position B,are so arranged that tape 20 is bent over a bending edge 25 at the endof guide means 23.

A second guide means 30 has a second guide channel 40, best seen in FIG.3, which ends at 60 in the guide channel 24, and extends at an acuteangle to the same. A supply reel 31 carries a supply of the attachingband 33 shown in FIG. 7, and is rotatably mounted in a curved supportwhich is provided with a slot through which the attaching band 33 issupplied into guide channel 40. The coil 31 of attaching band 33 is insuch a position that the adhesive tape 36 faces downwardly, and islocated under the carrier web 34 as also shown in FIG. 3. The guidemeans 30 includes a base plate 41 with a stepped bottom face having ahigh longitudinal portion 42 and a low longitudinal portion 43 forming arecess in which the tape 36 can move without touching portion 43 of thebottom face. The high longitudinal portion 42 is about as wide as thefree strip portion 37 of the carrier web 34 and located directly abovethe high portion 42. A longitudinal groove 44 having a substantiallytriangular cross section is provided in the top face of the high portion42. Guide channel 40 is covered by a cover plate 49 which has alongitudinal slot 46 above which a needle 50 is arranged As best seen inFIG. 1, the needle is mounted on a hydraulic motor 51 which can beoperated to advance needle 50 from the normal retracted position shownin FIG. 3, to an advanced position penetrating carrier web 34, and moreparticularly the free longitudinal strip 37 of the same, and to enterinto the groove 44 without touching the portion 42 of the bottom plate41. In this advanced position, a horizontal hydraulic motor 53 which hasa movable member connected with hydraulic motor 51, can be operated toturn hydraulic motor 51 with needle 50 in the directions of the arrow54, and when hydraulic motor 51 is moved to the right as viewed in FIG.1 while needle 50 penetrates the free portion 37 of the carrier web 34,the attaching band 33 is advanced one step to the right, while a cuttingmeans 58 is in a retracted position as schematically indicated by thearrow 59. When a section of attaching band 33 has been advanced in thismanner into the guide channel 24, cutter 59 is lowered and therespective section cut off. Such a section of the attaching band 33 willbe hereinafter referred to as an attaching unit which consists of acarrier sheet and an adhesive tape portion. The length of the attachingunit is determined by the stroke of servo motor 53, and corresponds tothe length of the tape portion 27 which is to be inserted betweenwindings of coil 26.

After the attaching unit is cut off from attaching band 33 has beeninserted into guide channel 24, it is pressed by a presser roller 62against band 20, as best seen in FIG. 4. Two presser rollers 62 areprovided and rotatably mounted in a supporting structure 63 which can bemoved by a hydraulic motor, not shown, up and down in the direction ofthe arrow 65. As shown in FIGS. 4 and 5, the presser rollers 62 haveabout half the width of the carrier web or carrier sheet, and arelocated over the strip portion of the same which carries the adhesivetape 36 so that the latter is pressed against the central portion ofband 20, as is apparent from FIG. 6. The free strip portion 37 of therespective attaching unit, is not engaged by a roller 62, but is engagedby a folding plate 36 which has a slanted guide edge engaging the stripportion 37 and bends the same out of the plane of the carrier sheet andof tape 36. The guide edge of folding plate 68 gradually approaches thelateral face of presser roller 62, as is apparent from a comparison ofFIGS. 4 and 5, so that strip portion 37 is bent to a positionperpendicular to the strip portion to which tape 36 is attached. Thecarrier sheet has now an angular profile, and is stiff and difficult tobend.

In the embodiment of FIGS. 8 and 9, the folding plate 68 is replaced bya rounded folding channel 37 which is part of a member 80 secured toguide plate 23. The curved folding channel 37 engages the free stripportion 37 of the carrier sheet, and bends the same 180 upon itself, asbest seen in FIG. 9 so that the entire carrier sheet also becomes rigidand resistible to bending. Only one presser roller 62 is required, andis carried by a supporting structure 63 which is operated in thedirection of the arrow 65 to press the tape 36 with its free adhesiveside against the wound up band 20.

OPERATION At the beginning, and shortly before the ending of the windingof the coil 26, the attaching band 33 is advanced by transporting means50, 51, 53 one step so that a section of at taching band 33, whoselength corresponds to the length of a tape piece 27, is advanced intoguide channel 24 of the guide means 22, whereupon cutting means 58 isoperated to cut off an attaching unit having the required length whileneedle 50 is retracted by hydraulic motor 51. The cut off attaching unitadheres to the wound up band and is transported with the same under thepresser roller 62 which assure a firm adhesive connection between tape36 and band 20. At the same time, folding plate 68 in the embodiment ofFIGS. 4 and 5, and folding means 80 in the embodiment of FIGS. 8 and 9,bend the free strip portion 37 of the carrier sheet of the respectiveattaching unit out of the plane of band 20 and of the strip portion ofthe carrier sheet which carries adhesive tape 36, so that the carriersheet becomes stiff, particularly against transverse bending. As bestseen in FIG. 1, guide plate 68 projects beyond the end of the guidemeans 22 so that the carrier sheet 33 remains in the folded angularposition. The wound up band 20 is pulled around the bending edge 25, andsince the stiff folded carrier sheet cannot be bent, the respectiveadhesive tape portion 36 separates from the stiff angular carrier sheetand continues to travel with band 20 toward coil 26. The material of thecarrier web 34, and the properties of the adhesive on both sides of tape36, are so selected that tape 36 rather separates from the stiff carriersheet 34 than from the wound up band 20. A separation must take place,since the angular stiff carrier sheet cannot be bent about bending edge25.

The carrier sheet 33, separated from the tape 36, is subjected to an airstream produced by a blower, not shown, so that the folded carrier sheetis deflected to the position 70 in FIGS. 1 and 8, and moves in thedirection of the arrow 72 to a collecting receptacle, not shown. Theadhesive tape 36, in the position shown in FIG. 6, adheres to theoutside of the wound up band 20, so that the next following winding ofband 20 is in contact with the free side of the adhesive tape portion27, and adheres to the same so that the respective two superimposedwindings are secured, and coil 26 cannot unwind due to elasticity of thewindings of band 20. As shown in FIGS. 1 and 2, in positions C and B,respectively, the two innermost windings and the two outermost windingsof a coil 26 are preferably secured by adhesive tape pieces 27.

If the transporting means 51, 53, 50 and the cutting means 58 are notprovided, the entire continuously supplied adhesive tape 36 would bewound together with band 20, and all windings of coil 27 would beadhesively connected to each other and to tape 36.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofapparatus for securing superimposed windings of a coil by pieces ofadhesive tape differing from the types described above.

While the invention has been illustrated and described as embodied in anarrangement in which a carrier web is folded to become stiff so that anadhesive tape adhering to the same can be peeled off by bending over anedge, it is not intended to be limited to the details shown, sincevarious modifications and structural changes may be made withoutdeparting in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can by applying current knowledgereadily adapt it for various applications without omitting featuresthat, from the standpoint of prior art, fairly constitute essentialcharacteristics of the generic or specific aspects of this inventionand, therefore, such adaptations should and are intended to becomprehended within the meaning and range of equivalence of thefollowing claims.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims.

I claim:

1. A method for securing superimposed windings of a coil, comprisingwinding up a band to form a coil of superimposed windings; supplying tosaid band during winding of the same an attaching unit including acarrier sheet and a narrow tape, adhesive on both sides and beingattached with one adhesive side to one lateral strip portion of saidcarrier sheet, so that the other adhesive side of said tape adheres to aportion of said band whereby said attaching unit is transported by saidband; folding the other lateral strip portion of said carrier sheet outof the plane of said one lateral strip portion and of said adhesive tapeabout a longitudinal fold line so that the folded carrier sheet becomesstiff; bending said portion of said band away from said stiff foldedcarrier sheet so that said adhesive tape, unable to bend the same,adheres to said bent portion of said band and is peeled off from saidfolded carrier sheet; winding up said portion of said band with saidadhesive tape to fonn a winding having said adhesive tape on the outsidethereof; and winding another winding superimposed on said winding and onsaid one adhesive side of said tape so that said windings are secured toeach other and prevent unwinding of said coil.

2. The method of claim 1 comprising supplying an attaching band composedof integrally connected attaching units and including a carrier web anda narrow adhesive tape adhesively attached to the same; stepwisetransporting said attaching band; cutting said attaching units off saidattaching band; placing each attaching unit on a portion of said woundup band; and applying pressure to each attaching unit so that saidadhesive tape thereof adheres to said wound up band.

3. The method of claim 1 wherein two superimposed adhesively connectedwindings are located at each end of said wound up band forming saidcoil; and wherein said attaching units are supplied when the beginningand the end of said band are being wound up.

4. Apparatus for securing superimposed windings of a coil comprisingrotary take up means for winding up a band; first guide means having aguide channel for guiding a supplied band to said take up means, and abending edge at the delivery end of said guide channel about which saidband is bent before being wound up; second guide means for guiding anattaching band into said guide channel, said attaching band including awide carrier web, and a narrow tape adhesive on both sides and beingadhesively attached with one adhesive side to one lateral strip portionof said carrier web, said attaching band being guided in a position inwhich the other adhesive side of said tape is placed on a face of saidwound up band; presser means engaging said one strip portion forpressing said tape against said face so that said other adhesive sideadheres to said face and said attaching band moves with said wound upband; and folding means in said guide channel for folding the otherlateral strip portion of said carrier web out of the plane of said onestrip portion and of said adhesive tape so that the folded carrier webbecomes stiff whereby said adhesive tape bending with said wound up bandabout said bending edge is peeled off the stiff unbendable carrier weband is placed between two superimposed windings of said wound up bandadhesively connecting the same.

5. Apparatus as claimed in claim 4 wherein said guide channel has abottom face slidably guiding said wound up band; wherein said secondguide means guide said attaching band into said guide channel with saidtape attached to the underside of said carrier web; and wherein saidpresser means include pressure roller means having a lower portionprojecting into said guide channel and pressing against the upper faceof said one strip portion of said carrier web, the axial width of saidpresser roller means being substantially the same as the width of saidone strip portion, and the width of said guide channel being greater.

6. Apparatus as claimed in claim wherein said folding means includes afolding plate widening along said guide channel and disposed under saidother strip portion for gradually folding the same about a fold lineduring movement of said attaching band along said guide channel into afolded position perpendicular to said one strip portion of said carrierweb.

7. Apparatus as claimed in claim 5 wherein said folding means includes arounded folding channel widening along said guide channel and disposedfor folding said other strip portion to a position bent substantially180 upon said one strip portion.

8. Apparatus as claimed in claim 4 wherein said second guide means has asecond guide channel for said attaching band, said second guide channelhaving a stepped bottom face with a high longitudinal portion forguiding said other strip portion, and a low longitudinal portion forminga recess in which said adhesive tape is located spaced from said lowlongitudinal portion; and wherein said second guide channel ends in saidguide channel of said first guide means before said pressure means sothat the downward facing adhesive side of said tape is placed on the topface of said wound up band.

9. Apparatus as claimed in claim 8 wherein said high longitudinalportion has a longitudinal groove; and comprising a transporting needleabove said groove; means for reciprocating said needle between aretracted position, and an advanced position projecting through saidother lateral strip portion into said groove; and means forreciprocating said needle in the longitudinal direction of said grooveand of said second guide channel for stepwise transporting saidattaching band.

10. Apparatus as claimed in claim 9 wherein said second guide meansincludes a cover plate for closing said second guide channel, and havinga longitudinal slot for the passage of said needle.

11. Apparatus as claimed in claim 9 comprising cutting means disposed atthe delivery end of said second guide channel outside of said guidechannel of said first guide means and before said presser means, andbeing reciprocable in synchronism with the movements of said needle tocut said attaching band into attaching units supplied to said wound upband in said guide channel of said first guide means and beingtransported by said wound up band due to the adhering of said adhesivetape to the same.

12. Apparatus as claimed in claim 4 comprising transporting meansengaging the other strip portion of said carrier web for stepwisetransporting said attaching band along said second guide means; andcutting means for cutting said stepwise transported attaching band aftereach step so that said attaching band is cut into said attaching unitssupplied to said wound up band in said guide channel and beingtransported by said wound up band due to the adhering of the adhesivetape of the respective attaching unit to said wound up band.

1. A method for securing superimposed windings of a coil, comprisingwinding up a band to form a coil of superimposed windings; supplying tosaid band during winding of the same an attaching unit including acarrier sheet and a narrow tape, adhesive on both sides and beingattached with one adhesive side to one lateral strip portion of saidcarrier sheet, so that the other adhesive side of said tape adheres to aportion of said band whereby said attaching unit is transported by saidband; folding the other lateral strip portion of said carrier sheet outof the plane of said one lateral strip portion and of said adhesive tapeabout a longitudinal fold line so that the folded carrier sheet becomesstiff; bending said portion of said band away from said stiff foldedcarrier sheet so that said adhesive tape, unable to bend the same,adheres to said bent portion of said band and is peeled off from saidfolded carrier sheet; winding up said portion of said band with saidadhesive tape to form a winding having said adhesive tape on the outsidethereof; and winding another winding superimposed on said winding and onsaid one adhesive side of said tape so that said windings are secured toeach other and prevent unwinding of said coil.
 2. The method of claim 1comprising supplying an attaching band composed of integrally connectedattaching units and including a carrier web and a narrow adhesive tapeadhesively attached to the same; stepwise transporting said attachingband; cutting said attaching units off said attaching band; placing eachattaching unit on a portion of said wound up band; and applying pressureto each attaching unit so that said adhesive tape thereof adheres tosaid wound Up band.
 3. The method of claim 1 wherein two superimposedadhesively connected windings are located at each end of said wound upband forming said coil; and wherein said attaching units are suppliedwhen the beginning and the end of said band are being wound up. 4.Apparatus for securing superimposed windings of a coil comprising rotarytake up means for winding up a band; first guide means having a guidechannel for guiding a supplied band to said take up means, and a bendingedge at the delivery end of said guide channel about which said band isbent before being wound up; second guide means for guiding an attachingband into said guide channel, said attaching band including a widecarrier web, and a narrow tape adhesive on both sides and beingadhesively attached with one adhesive side to one lateral strip portionof said carrier web, said attaching band being guided in a position inwhich the other adhesive side of said tape is placed on a face of saidwound up band; presser means engaging said one strip portion forpressing said tape against said face so that said other adhesive sideadheres to said face and said attaching band moves with said wound upband; and folding means in said guide channel for folding the otherlateral strip portion of said carrier web out of the plane of said onestrip portion and of said adhesive tape so that the folded carrier webbecomes stiff whereby said adhesive tape bending with said wound up bandabout said bending edge is peeled off the stiff unbendable carrier weband is placed between two superimposed windings of said wound up bandadhesively connecting the same.
 5. Apparatus as claimed in claim 4wherein said guide channel has a bottom face slidably guiding said woundup band; wherein said second guide means guide said attaching band intosaid guide channel with said tape attached to the underside of saidcarrier web; and wherein said presser means include pressure rollermeans having a lower portion projecting into said guide channel andpressing against the upper face of said one strip portion of saidcarrier web, the axial width of said presser roller means beingsubstantially the same as the width of said one strip portion, and thewidth of said guide channel being greater.
 6. Apparatus as claimed inclaim 5 wherein said folding means includes a folding plate wideningalong said guide channel and disposed under said other strip portion forgradually folding the same about a fold line during movement of saidattaching band along said guide channel into a folded positionperpendicular to said one strip portion of said carrier web. 7.Apparatus as claimed in claim 5 wherein said folding means includes arounded folding channel widening along said guide channel and disposedfor folding said other strip portion to a position bent substantially180* upon said one strip portion.
 8. Apparatus as claimed in claim 4wherein said second guide means has a second guide channel for saidattaching band, said second guide channel having a stepped bottom facewith a high longitudinal portion for guiding said other strip portion,and a low longitudinal portion forming a recess in which said adhesivetape is located spaced from said low longitudinal portion; and whereinsaid second guide channel ends in said guide channel of said first guidemeans before said pressure means so that the downward facing adhesiveside of said tape is placed on the top face of said wound up band. 9.Apparatus as claimed in claim 8 wherein said high longitudinal portionhas a longitudinal groove; and comprising a transporting needle abovesaid groove; means for reciprocating said needle between a retractedposition, and an advanced position projecting through said other lateralstrip portion into said groove; and means for reciprocating said needlein the longitudinal direction of said groove and of said second guidechannel for stepwise transporting said attaching band.
 10. Apparatus asclaimed in claim 9 wherein said second Guide means includes a coverplate for closing said second guide channel, and having a longitudinalslot for the passage of said needle.
 11. Apparatus as claimed in claim 9comprising cutting means disposed at the delivery end of said secondguide channel outside of said guide channel of said first guide meansand before said presser means, and being reciprocable in synchronismwith the movements of said needle to cut said attaching band intoattaching units supplied to said wound up band in said guide channel ofsaid first guide means and being transported by said wound up band dueto the adhering of said adhesive tape to the same.
 12. Apparatus asclaimed in claim 4 comprising transporting means engaging the otherstrip portion of said carrier web for stepwise transporting saidattaching band along said second guide means; and cutting means forcutting said stepwise transported attaching band after each step so thatsaid attaching band is cut into said attaching units supplied to saidwound up band in said guide channel and being transported by said woundup band due to the adhering of the adhesive tape of the respectiveattaching unit to said wound up band.